Spinning pump



Sept. 18, 1928.

C. W. LAWSER SPINNING PUMP Filed Dec. 29, 1926 6 i (M1 60 Wlawaer.

Patented Sept. 18, 1928.

UNITED STATES PATENT OFFICE.

CHARLES W. ,LAWSER OF BALA, PENNSYLVANIA, ASSIGNOR TO WICACO SCREW & MACHINE WORKS, INC., OF PHILADELPHIA, PENNSYLVANIA, A CORPORATION OF PENNSYLVANIA.

SPINNING PUMP.

Application filed December 29, 1926. Serial No. 157,764.

This invention relates to improvements in pumps of the type used in the manufacture of artificial silk for forcing the viscous base substance through the spinnerets.

' It is customary in the type of pump to which this invention particularly relates to pivotally mount the pump in a bracket or base by means of'hollow nipples or arms which engage the pump casing at and register with the intake and exhaust ports respectively, the nipples or arms functioning both to pivotally support and to conduct the viscous base substance to and from the pump. It is the principal object of the present invention to provide a novel construction of pump casing whereby the pressure applied to the pump casing when clamped in the bracket will not distort the pump cylinder. In the attached drawings:

Figure 1 is a side View of a pump made in accordance with my invention; Fig. 2 is an end elevation; lgig. 3 is a rear end elevation of the pump, an

Fig. 4 is a partial longitudinal sectional view on the line 4-4, Fig. 1.

Referring to the drawings, the pump comprises a cylinder casing 1 in which is mount- 3 ed a rotor 2. A cylindrical extension '3 of the rotor 2 projects through an opening in the cylinder head 4 and has attached thereto a gear 5 by means of which the rotor 2 may be rotated in the cylinder. In the present instance, the gear 5 is a spiral gear and is adapted, when mounted as hereinafter described, to mesh with a worm 6 on a drive shaft 7. The rotor 2 has in the present instance a pair of longitudinal cylindrical bores 8 and 9 which have at their inner ends transverse channels or ports, 11 and 12 respectively, opening into the sides of the piston, and these ports are adapted as hereinafter described to communicate with suitably arran ed intake and discharge ports in the cylin er casing 1. The pump further comprises a pair of plungers 13 and 14 which reciprocate in the cylinders 8 and 9, and which are actuated through the medium of a cam or the like (not shown) in the casing. The form of the plunger actuating means may vary widely, as well understood in the art, and forms no part of the present invention.

In the walls of the casing are formed, in

respectively extend around slightly less than half of the circumference of the cylinder. As shown in Figs. 1, 2 and 3, the casing 1 is formed with a transverse boss or enlargement 17 at one side, and in this enlargement 17 and at opposite sides of the casing are formed an intake port 18 and a discharge port 19, these ports communicating respectively with the channels 15 and 16 through passages 21 and 22. It will now be seen that as the rotor 2 is rotated in the cylinder, the cylinders 8 and 9 are connected, through a part of each revolution with the intake port 18, and for another part, with the discharge port 19. The movement of the plungers 13 and 14 are timed with respect to the rotation of the rotor 2 and the positions of the grooves 15 and 16 so that during the period in which the respective cylinders 8 and 9 are connected with the intake port 18, the plungers are being retractedor withdrawn from the cylinders, whereas during the period that the cylinders are connected with the discharge port 19, the pistons are advancing in the cylinders.

It is customary to mount pumps of this type pivotally through the medium of hollow nipples connected respectively with the source of supply of the viscous substance from which theartificial silk is formed and with the spinnerets through which the substance is extruded in thread-like formation, the nipples engaging the casing respectively at the intake and discharge ports. The hollow nipples are shown in Figs. 1 to 3, inclusive, and are designated by the reference numerals 23 and 24..

It will be noted that the pivotal axis of the casing through these nipples is parallel with the axis of the worm shaft 7. With this arrangement, and by reason of the natural tendency of the wormand spiral gear to separate, excessive pressure occurring within the pump results in the casing tilting upwardly at the front around the saidpivotal axis until the gear 5 and worm 6 are disengaged. To maintain the operative relation between the gear 5 and the worm 6 under normal conditions, it is necessary to securely clamp the casing between the nipples 23 and 24. It hasbeen customary in the past to design the casing so that the intake and dis- I ports, sa1

charge ports are on opposite sides of the cylinder in which the rotor 2 rotates, and under these circumstances pressure exerted between the nipples may and frequently does result in a distortion of the cylinder with a consequent loss of efiiciency in the pump, un-. due wearing of the parts, and defective operation seriously affecting production. In the present instance, it will be noted that the pivotal axis between the nipples 23 and 24 is eccentrically arranged with respect to the cylinder to an extent positively preventing distortion of the cylinder re ardless of the pressure that may be applied to the casing between the nipples. In other words, by forming the casing 1 with the ofiset part 1 in which the ports '18 and 19 are formed, I provide a practically solid abutment extendmg between the ports capable of withstanding any pressure that-may be applied to the casing in the bracket, without adversely affecting the pump.

I claim:

1. A spinning pump comprising a casing having a cylindrical chamber and a solid transverse portion ofi'setlaterally with respect to'the axis of said chamber and having at opposite sides thereof ports communicating with the chamber, means for clamping the cylinder pivotall between elements respectivel engaging t e casing at said clamping elements having passages communicating with said ports whereby the connection between the ports and the passages is maintained regardless of the angular position of the casing with respect to the pivotal axis, a rotor mounted in the casing, means operatively associated with the rotor for drawing a fluid substance into the casing through one of said ports and the associated clamping element and for discharging it through the other port and clamping element, a cylindrical extension on the rotor projecting through an end of the casing, a gear on said projection, and power means operatively connected with said gear for rotating the rotor in the cylinder.

2. In a spinning pump, the combination with a casing having a cylindrical chamber, and intake and discharge ports communicating therewith, means 0 erative in the chamber to draw a fluid su stance through said intake port and to eject it through said discharge port, and means for pivotally mounting the casing on an axis transverse to the longitudinal axis of said chamber whereby said pivotal axis is eccentrically arranged withrespect to said cylindrical chamber. I

3. In a pump, the combination with a casing havin intake, and discharge ports and a cylindrical chamber, of means includ-. ing a rotor in said chamber for drawing a fluid material into the casing through the intake port and ejecting it through the disrotor mounted in said chamber for drawing a fluid into the casing through one port and discharging it through the other, a spiral gear operatively associated with the rotor on the outside of said casing and adapted to be connected to an external source of power and means for mounting the casing on a pivotal axis extending at right angles to and offset laterally from the axis of rotation of said rotor.

5. In a spinning pump, the combination with a casing having in opposite sides intake and discharge ports and a cylindrical chamber with which the ports communicate, of means including a rotor in said chamber for drawing a fluid material into the casing through the intake port, and ejecting it through the discharge port, said casing being adapted for pivotal mounting between clamping elements engaging the casing respectively at said ports, and said ports being arranged on a line transverse to and laterally offset from the axis ofrot-ation of said rotor so that the pressure between the clamping elements is applied to the casing eccentrically with respect to the cylindrical chamberl 6. In a spinning pump, the combination with a casing having intake and discharge ports and a cylindrical chamber with which the ports communicate, of means including a rotor rotatabl mounted in said chamber for drawing a uid into the casing throu h one port and discharging it through t e other, a spiral gear coaxially connected with the rotor on the outside of said casing and applied to the casing eccentrically with respect to said chamber.

7. In a spinning pump, the combinatlon with a casing havlng a cylindrical chamber and intake and discharge ports communieating with said chamber, said ports being arranged in opposite sides of the casing onon a line transverse to and ofi'set laterally from the longitudinal axis of said chamber,

of means including a rotor mounted in the i said chamber for drawing a fluid into the casing through one port and discharging it v through the other, a spiral gear connected 0 coaxially with the rotor at one end and externally of the casing, and means including i opposed clamping elements respectively en-,

gaging the casing at the said ports for pivotally mounting the casing. v I

8. In a spinning pump, the combination with a casing having a cylindrical chamber and intake and discharge ports communicating with said chamber, said ports being so arranged as to adapt the pump for pivotal mounting on clamping elements engaging the casing at said ports respectively,

ofmeans operative within the chamber for drawing a fluid material into the casing through the intake port and ejecting it 15 pressure applied to the casing by the said clamping elements to prevent distortion of 20 the casing aifecting the normal operation of the parts within the said chamber.

CHARLES W. LAVVS/ER. 

